|
|||||
|
|
| 磷酸盐对土壤中外源钕交换态及生物有效性的影响 | |
| 引用本文： | 徐仲均,李德成,杨剑虹,彭安.磷酸盐对土壤中外源钕交换态及生物有效性的影响[J].环境科学,2001,22(3):66-69. |
| 作者姓名： | 徐仲均 李德成 杨剑虹 彭安 |
| 作者单位： | 1. 中国科学院生态环境研究中心环境水化学国家重点实验室,北京,100085；西南农业大学资源与环境学院,重庆,400716 2. 中国科学院生态环境研究中心国家重点环境水化学实验室,北京,100085 3. 西南农业大学资源与环境学院,重庆, 400716 |
| 基金项目： | 国家自然科学基金资助重大项目(29890280-1) |
| 摘 要： | 用放射性同位素147Nd示踪法,以pH8.2的NaAe为土壤中交换态N的提取剂,研究了磷酸盐对土壤中外源Nd的交换态及生物有效性的影响.结果表明,无论磷酸盐存在与否,加入土壤中的Nd 99.5%以上均被吸附.磷酸盐对稀土离子具有较强的沉淀作用,能够降低土壤中交换态Nd的含量,在实验中发现,KH2PO4在0.3g·kg-1～1.5g·-1范围内土壤中交换态Nd含量无明显变化.另外实验表明磷酸盐还具有降低小麦对Nd吸收的作用,分析得出土壤中交换态Nd浓度与小麦幼苗中Nd含量存在显著相关性. |
| 关 键 词： | 磷酸盐 Nd 交换态 生物有效性 |
| 文章编号： | 0250-3301(2001)03-04-0066 |
| 收稿时间： | 2000/7/10 0:00:00 |
| 修稿时间： | 2000年7月10日 |
Effect of Phosphate on the Exchangeable Form and the Bioavailability of Exogenous Neodymium in Soil |
|
| Xu Zhongjun,Li Decheng,Yang Jianhong and Peng An.Effect of Phosphate on the Exchangeable Form and the Bioavailability of Exogenous Neodymium in Soil[J].Chinese Journal of Environmental Science,2001,22(3):66-69. | |
| Authors: | Xu Zhongjun Li Decheng Yang Jianhong and Peng An |
| Affiliation: | SKLEAC, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085. |
| Abstract: | Effects of phosphate on the exchangeable form and the bioavailability of exogenous neodymium (Nd) in soil were studied with 147Nd isotopic tracer. Exchangeable Nd was extracted with solution (pH8.2) of NaAc. The results indicated that Nd beyond 99.5% was adsorbed by soil whether phosphate exists in soil or not. Phosphate can precipitate dramatically Nd3+. And the Nd phosphate precipitates may set limits on the concentration of exchangeable Nd observed in soil. KH2PO4 ranging from 0.3g·kg-1 to 1.5g·kg-1 make a uniform impact on the exchangeable form of Nd. In addition, phosphate in soil can inhibit wheat seedling to absorb Nd. The concentration of exchangeable Nd is correlated significantly with the content of Nd in wheat seedling. |
| Keywords: | phosphate neodymium exchangeable form bioavailability |
| 本文献已被 CNKI 万方数据 PubMed 等数据库收录！ | |
| 点击此处可从《环境科学》浏览原始摘要信息 | |
| 点击此处可从《环境科学》下载全文 | |
